Purge remaining last_id (now called block_hash)

runtime/src/accounts.rs

@@ -27,9 +27,9 @@ pub struct ErrorCounters {
     pub account_not_found: usize,
     pub account_in_use: usize,
     pub account_loaded_twice: usize,
-    pub last_id_not_found: usize,
-    pub last_id_too_old: usize,
-    pub reserve_last_id: usize,
+    pub block_hash_not_found: usize,
+    pub block_hash_too_old: usize,
+    pub reserve_block_hash: usize,
     pub insufficient_funds: usize,
     pub duplicate_signature: usize,
     pub call_chain_too_deep: usize,